Dual coil fuel injector having smart electronic switch
US6120005A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1998 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Sep 22, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M51/005
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injector apparatus includes an electromagnetic fuel injector having a housing and a magnetic circuit in the housing. The magnetic circuit includes a first coil having a certain resistance to generate a peak current and a second coil having a resistance greater than the certain resistance to generate a hold current. Circuit structure is disposed in the housing and is electrically coupled with the coils to selectively excite the coils. The circuit structure includes switch structure to transition the peak current to the hold current based on a preset threshold. In a preferred embodiment of the invention, the switch structure includes an RC circuit and a comparator which sets a threshold voltage. A time constant of the RC circuit is provided to be an analog model of an inductance and resistance time constant of the fuel injector such that when a voltage of a capacitor of the RC circuit exceeds the threshold voltage, the peak current is transitioned to the hold current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.